Boyfriend Jason Trawick was spotted watching the show from the side of the stage.

"Spears performed like a pro throughout the show, hitting all her marks … she seemed at ease," The Sacramento Bee's Carla Meyer wrote. "The sellout crowd — composed mainly of young women who were kids when Spears was a teen star — thrilled from the start to Spears' stellar pop songs."

Following her show, she Tweeted, "Can't sleep. WAY too much Adrenaline right now. Sacramento was on fire tonight. You ready San Jose? Cause I am!!!!"